Poor Customer service

Up to now I just received very bad service. We upgraded our phones on Saturday, 11 May 2019. We did a Sim swop on my contract. As per MTN call centre, I had to go back to the store yesterday (15/05/2019,100km's on my own expense). Caydice told me that they will activate everything. Yesterday afternoon, I experienced that I couldn't make a call. This morning (16/05/2019), again I am unable to make calls or receive calls. My data is working. This is the same problem as yesterday.